Gear Ratio Calculator

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Calculates the ratio of rotational speeds or torques between meshed gears.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Number of Teeth on Driven Gear and Number of Teeth on Driving Gear in the units shown.

Step 2

Read Gear Ratio and Speed Ratio (Driven/Driving) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Number of Teeth on Driven Gear: 40; Number of Teeth on Driving Gear: 20

Gear Ratio: 2; Speed Ratio (Driven/Driving): 0.5

Number of Teeth on Driven Gear: 60; Number of Teeth on Driving Gear: 15

Gear Ratio: 4; Speed Ratio (Driven/Driving): 0.25

Number of Teeth on Driven Gear: 30; Number of Teeth on Driving Gear: 30

Gear Ratio: 1; Speed Ratio (Driven/Driving): 1

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